[Community Puzzle] Fun with CGX Expressions

Coding Games and Programming Challenges to Code Better

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Created by @Eulero314,validated by @regismeysso22,@cedricdd and @Rafarafa.
If you have any issues, feel free to ping them.

For me, all 9 test cases and 8/9 validators pass. I am not passing the last validator. Could I get a hint as to what I might be missing? Much appreciated.

Does your code process / output properly a negative fraction where the numerator is greater than the denominator?

Oh, that was it. Thank you so much.